When SignalManager is being destructed and calls qDeleteAll on the map of global receivers, a deletion of one receiver might indirectly cause another receiver to be deleted. This will cause a double delete when qDeleteAll tries to delete the already deleted second receiver. Fix this by deleting the first map element in a loop while the map is not empty. This makes sure that if an indirect delete does happen, it won't invalidate any iterator, because we call begin() again to get a new iterator. Task-number: PYSIDE-88 Change-Id: I9e812271c1a86607094006bc01eb55c930d7fa95 Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>